CVE-2021-30062 – This vulnerability allows attackers to bypass O... (How to Fix)

Q: What is the severity of CVE-2021-30062?

CVE-2021-30062 has a CVSS score of 7.5 (HIGH). This vulnerability allows attackers to bypass OPC security enforcement on Schneider Electric ConneXium Tofino and Belden Tofino Xenon industrial security appliances by sending specially crafted OPC packets. This affects industrial control systems using these appliances for OPC protocol security. Attackers could potentially manipulate industrial processes or bypass security controls.

📋 TL;DR

This vulnerability allows attackers to bypass OPC security enforcement on Schneider Electric ConneXium Tofino and Belden Tofino Xenon industrial security appliances by sending specially crafted OPC packets. This affects industrial control systems using these appliances for OPC protocol security. Attackers could potentially manipulate industrial processes or bypass security controls.

💻 Affected Systems

Products:

Schneider Electric ConneXium Tofino OPCLSM TCSEFM0000
Belden Tofino Xenon Security Appliance

Versions: All versions before 03.23

Operating Systems: Embedded industrial OS

Default Config Vulnerable: ⚠️ Yes

Notes: Affects devices with OPC enforcer functionality enabled. These are industrial security appliances deployed in operational technology networks.

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Complete bypass of industrial security controls allowing unauthorized access to industrial processes, potential manipulation of physical equipment, safety system compromise, or production disruption.

🟠

Likely Case

Unauthorized access to OPC data streams, manipulation of industrial process data, or bypassing of security monitoring for industrial networks.

🟢

If Mitigated

Limited impact if proper network segmentation, additional security layers, and monitoring are in place to detect anomalous OPC traffic.

🌐 Internet-Facing: MEDIUM - While these devices are typically deployed internally, if exposed to internet they become vulnerable to remote exploitation.

🏢 Internal Only: HIGH - These are critical industrial security appliances; compromise could affect entire industrial control systems.

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ⚠️ Yes

Complexity: MEDIUM

Exploitation requires crafting specific OPC packets but does not require authentication. Knowledge of OPC protocol and industrial networks needed.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 03.23 or later

Vendor Advisory: https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-011-05

Restart Required: Yes

Instructions:

1. Download firmware version 03.23 or later from Schneider Electric/Belden support portal. 2. Backup current configuration. 3. Upload and install new firmware via web interface or management tool. 4. Reboot appliance. 5. Verify firmware version and functionality.

🔧 Temporary Workarounds

Network Segmentation

all

Isolate affected appliances in separate network segments with strict firewall rules limiting OPC traffic.

Traffic Monitoring

all

Implement network monitoring for anomalous OPC packets and set up alerts for suspicious patterns.

🧯 If You Can't Patch

Implement strict network access controls to limit which systems can send OPC traffic to the appliance
Deploy additional security monitoring specifically for OPC protocol anomalies and unauthorized access attempts

🔍 How to Verify

Check if Vulnerable:

Check firmware version via web interface or CLI. If version is below 03.23, device is vulnerable.

Check Version:

Check via web interface: System > About, or via CLI using manufacturer-specific commands

Verify Fix Applied:

Verify firmware version shows 03.23 or higher after update. Test OPC enforcement functionality.

📡 Detection & Monitoring

Log Indicators:

Unusual OPC packet patterns
OPC enforcement bypass alerts
Failed security policy enforcement logs

Network Indicators:

Malformed OPC packets
OPC traffic bypassing expected security controls
Anomalous OPC communication patterns

SIEM Query:

source="tofino_logs" AND (event_type="opc_bypass" OR message="OPC enforcement failure")

📊 Metadata

CVE ID: CVE-2021-30062

CVSS v3 Score: 7.5 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Published: April 3, 2022

Last Updated: November 21, 2024

🔗 References

https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-011-05 Vendor Advisory
https://www.belden.com/support/security-assurance Vendor Advisory
https://download.schneider-electric.com/files?p_Doc_Ref=SEVD-2022-011-05 Vendor Advisory
https://www.belden.com/support/security-assurance Vendor Advisory

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📋 TL;DR

💻 Affected Systems

📦 What is this software?

Eagle 20 Tofino 943 987 501 Tx\/tx Firmware by Belden

Eagle 20 Tofino 943 987 502 Tx\/mm Firmware by Belden

Eagle 20 Tofino 943 987 504 Mm\/tx Firmware by Belden

Eagle 20 Tofino 943 987 505 Mm\/mm Firmware by Belden

Tcsefm0000 Firmware by Schneider Electric

Tofino Argon Fa Tsa 100 Tx\/tx Firmware by Belden

Tofino Argon Fa Tsa 220 Mm\/mm Firmware by Belden

Tofino Argon Fa Tsa 220 Mm\/tx Firmware by Belden

Tofino Argon Fa Tsa 220 Tx\/mm Firmware by Belden

Tofino Argon Fa Tsa 220 Tx\/tx Firmware by Belden

Tofino Xenon Security Appliance Firmware by Belden